Hi,
I have some questions about raid & lvm. I currently have raid 5 set up via mdadm and lvm (lvm2) set up along with it, running on an old Ubuntu Studio (8.10). I need to upgrade (via fresh install) to a more recent (9.10) version of the system but am not sure what steps to take to sync the new OS install with the old raid/lvm set-up. I have an OS hard drive that is separate from my raid/lvm hard drives. I'd like to install Ubuntu Studio, Solaris and/or OpenBSD, and another *nix onto the computer. I plan on using Studio for music recording/composing purposes and another unix/linux install for normal computer uses. First things first, I'd like to get Ubuntu Studio 9.10 up and running and also working with the raid/lvm disks. How do I do that?
I have some basic ideas but don't know if I'm missing any steps.
Here are some info on my current set-ups...
Code:
# vgscan
Reading all physical volumes. This may take a while...
Found volume group "vg0" using metadata type lvm2
Code:
# vgdisplay
--- Volume group ---
VG Name vg0
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 931.52 GB
PE Size 4.00 MB
Total PE 238468
Alloc PE / Size 238468 / 931.52 GB
Free PE / Size 0 / 0
VG UUID q9qxE4-tp1X-PUZl-cWfE-PGI3-3y4X...
Code:
# pvscan
PV /dev/md0 VG vg0 lvm2 [931.52 GB / 0 free]
Total: 1 [931.52 GB] / in use: 1 [931.52 GB] / in no VG: 0 [0 ]
Code:
# pvdisplay
--- Physical volume ---
PV Name /dev/md0
VG Name vg0
PV Size 931.52 GB / not usable 2.75 MB
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 238468
Free PE 0
Allocated PE 238468
PV UUID Xw1LeW-LRbq-Xt0J-0XtR-fEfi-5LBk...
Code:
# df -h
/dev/mapper/vg0-vault
755G 293G 463G 39% /studio/vault
/dev/mapper/vg0-zone 87G 184M 83G 1% /zone
/dev/mapper/vg0-nomad
87G 342M 82G 1% /nomad
Code:
$ fdisk -l
Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000c177d
Device Boot Start End Blocks Id System
/dev/sdb1 1 60801 488384001 fd Linux raid autodetect
Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000caa62
Device Boot Start End Blocks Id System
/dev/sdc1 1 60801 488384001 fd Linux raid autodetect
Disk /dev/sdd: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000d3415
Device Boot Start End Blocks Id System
/dev/sdd1 1 60801 488384001 fd Linux raid autodetect
Code:
$ more /etc/fstab
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /dev/sda5
UUID=aab73c93-5c74-4252-b2db / ext3 relatime,error
s=remount-ro 0 1
# /dev/sda1
UUID=90e2151d-168b-4918-9019 /boot ext3 relatime
0 2
# /dev/sda6
UUID=a8097c76-3754-4c5a-8371 /studio/workspace ext3 relatime
0 2
# /dev/sda2
UUID=30DCC729DCC6 /windows ntfs defaults,umask=007,gid=46 0
1
# /dev/sda7
UUID=43caaa32-d48f-414a-87b7 none swap sw
0 0
# /dev/sda8
UUID=8b3abdfd-a4cb-478d-b84d none swap sw
0 0
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0
/dev/vg0/vault /studio/vault xfs rw,noatime 0 0
/dev/vg0/zone /zone ext3 rw,noatime 0 0
/dev/vg0/nomad /nomad ext3 rw,noatime 0 0
Would I do the following, or am I leaving anything out?
For testing purposes (?)...
1. Boot live cd
2. Install mdadm & lvm2 (while running the live cd)
3. Run these commands:
sudo mdadm --assemble
sudo vgchange -a y
Or perhaps more precisely (?) the following, and this is during an actual OS install:
1. Install Ubuntu Studio 9.10 DVD (an alternate, not a "live" disc)
2. Install mdadm & lvm(2)
3. Enter the following commands:
$ sudo mdadm --assemble /dev/md0 --uuid=(???) /dev/sdb /dev/sdc /dev/sdd
$ sudo vgchange -a y
4. Copy old fstab file into new fstab file. (It can be backed up on another disk.)
5. Reboot
Where do I get the correct uuid for the mdadm re-assembly command?
Is including that uuid necessary?
Or is the fstab change really necessary?
Or will I need to still do some kind of "modprobe" for mdadm and/or lvm2?
I might be over-thinking some of this, I don't know, but I'd rather over than under-think it.
I'm running a 64-bit system, not sure if that matters here.
Thank you in advance for any help on this!